const util = require('util')
let a = util.format('%s is %d', 'huruji', 12);
let b = util.format('%s is a %s%s', 'huruji', 'FE');
let c = util.format('%s is a', 'huruji', 'FE');
let d = util.format('huruji', 'is', 'a', 'FE')
console.log(a);
console.log(b);
console.log(c);
console.log(d);

/**
 * huruji is 12
huruji is a FE%s
huruji is a FE
huruji is a FE
 */